The radio station 92.1 FM is quite bad. It is w________...

根据句子的结构和意思，‘The radio station 92.1 FM is quite bad. It is w__________ than 970 AM.’ 需要用形容词的比较级形式。‘worse’是‘bad’的比较级，表示‘更糟’。所以正确的答案是‘worse’，意思是‘92.1 FM的广播比970 AM的更糟’。